Brady and Victor were never close and Brady and Philip can't stand each other. It still doesn't make sense. Brady slept with Nicole while she was still married to Victor.

Brady and Philip aren't close, but Brady and Victor had a HUGE grandson-grandfather bond from 2003-2005. It felt like EVERY other word Victor said was "I am NOT going to let Nicole touch MY GRANDSON"

Yes, that was around the time that alcoholic crazy Nicole was scheming to get Jan to help kill Victor so she could then move on to poisoning Chloe's face leaving her forever disfigured allowing her to be with Brady, knowing (or at least thinking in her alcohol induced mind) he wouldn't want anything to do with the new and improved ghoul girl done "ala Nicole style"